Is a woman's embracing of Islam and her marriage religiously valid? And is it permissible for her to combine missed prayers after work due to the difficulty of performing them on time?

A woman's conversion to Islam is valid as long as she has pronounced the two testimonies (Shahadatayn), understanding their meaning and assenting to their implications. If her guardians are disbelievers, her marriage is valid if the Imam of the mosque marries her in the presence of two witnesses. It is permissible for a righteous man to marry her with her permission in the absence of a guardian or ruler. She must maintain the prescribed prayers at their appointed times, and it is not permissible to combine prayers without an excuse, except if it becomes difficult for her, as some scholars have permitted combining them out of necessity.